grr 6 channel audio card and only 2channel working

i have vista and i recently reformated the computer do to a missing driver which i found out later i could have gotten from gateway ne way i had trouble with the soundcard and the driver i got it updated and it was working for a while and i turned the volume up and all that was coming from the rear speakers was like electro static the center was working fine.

i disabled it then reabled it and went through and config the speakers again now it only will run 2 channel well three the sub too and ther is no sound at all from the center or the two rear speakers even tho its config for 5 its p***n me off ne ad vice its got me stunped to all belief HELP
 
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